Diodes Incorporated DDZ9717-7

Overview

DDZ9717-7 from Diodes Incorporated is a surface-mount low-current Zener diode in SOD123 package, rated for 43 V nominal zener voltage (min 40.85 V, max 45.15 V) at 50 µA test current, with 500 mW power dissipation on FR-4 PCB at TL = +75°C and 0.05 µA maximum reverse leakage at VR = 32.6 V. It serves as a precision voltage reference or overvoltage clamp in portable battery-powered sensor nodes and low-power analog signal conditioning circuits.

For engineers reviewing the DDZ9717-7 datasheet, DDZ9717-7 pinout, DDZ9717-7 application, or DDZ9717-7 equivalent, key selection criteria include its tight 43 V zener tolerance (±5%), ultra-low 50 µA test current enabling microamp-level biasing, SOD123 footprint compatibility with automated assembly, and verified thermal resistance (RθJA = 340 °C/W) for thermally constrained PCB layouts.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable voltage regulation under low-current conditions. Its design centers on low-bias operation: specified at IZT = 50 µA, with IR ≤ 0.05 µA at VR = 32.6 V and VF = 0.9 V at IF = 10 mA in forward conduction.

Thermal performance is defined for FR-4 PCB mounting with standardized pad layout: RθJL = 150 °C/W and RθJA = 340 °C/W. The device exhibits a positive temperature coefficient of approximately +0.08 %/°C near 43 V, per Fig. 20, supporting predictable drift behavior in ambient temperature ranges from –65 °C to +150 °C.

Key Specifications

Pinout & Package

DDZ9717-7 uses the SOD123 plastic molded package (UL 94V-0), measuring 1.55 mm × 2.65 mm × 1.05 mm (L × W × H), with cathode identified by a band on the case. Terminals are matte tin-annealed over Alloy 42 leadframe, solderable per MIL-STD-202 Method 208.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener diode applications.

Compared with BZX84-C43LT1G and MMSZ43ET1G, DDZ9717-7 uniquely enables microamp-level biasing with verified 0.05 µA leakage and SOD123 thermal performance, making it optimal for energy-harvesting and long-life battery systems where current budget and thermal margin are critical.

Availability

DDZ9717-7 is available at Aetrix Electronics and suitable for battery voltage monitors, low-power sensor references, ESD protection clamps, and overvoltage crowbar circuits requiring stable component supply with full traceability and lifecycle continuity.

Supply support for DDZ9717-7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.

The DDZ9xxx series belongs to Diodes' low-current Zener diode product line, engineered specifically for portable, battery-powered, and thermally constrained applications where minimal bias current and precise low-voltage regulation are essential.

FAQ

What is the maximum reverse voltage (VR) at which DDZ9717-7 guarantees ≤0.05 µA leakage?

Per Electrical Characteristics Table, DDZ9717-7 guarantees IR ≤ 0.05 µA at VR = 32.6 V. This value is derived from the 75% rule applied to its 43 V nominal zener voltage (0.75 × 43 V = 32.25 V, rounded to 32.6 V in datasheet). Operation above this voltage enters the breakdown region where controlled regulation begins.

Can DDZ9717-7 be used in place of a 43 V Zener with 1 mA test current?

No - DDZ9717-7 is characterized at 50 µA, not 1 mA. Its zener voltage shifts significantly with current: typical VZ at 1 mA is ~43.8 V (per Fig. 9 extrapolation), exceeding the ±5% spec. Using it at 1 mA introduces ~1.9% error versus nominal and invalidates guaranteed leakage and impedance specs.

Is DDZ9717-7 suitable for automotive applications?

The base DDZ9717-7 is not AEC-Q101 qualified. Only the DDZ9717Q-7 variant (with 'Q' suffix) meets automotive requirements: manufactured in IATF 16949 facilities, PPAP-capable, and qualified per AEC-Q101. Standard DDZ9717-7 is intended for industrial and consumer use.

What is the thermal resistance from junction to ambient (RθJA) for DDZ9717-7 on standard FR-4?

RθJA = 340 °C/W, measured on FR-4 PCB with minimum recommended pad layout at TL = +75°C (Note 5). This value assumes a 1-inch² copper pad; actual thermal performance degrades with smaller pads or non-thermal PCB stacks, requiring derating per Fig. 1.